1)i found this number in google, people usually see them in maps
2) the person who created this map
3)people who are findind a location in the nearest city
4)they give information about scale 0.2, 1.5  and it shows the altitute and the longtitute
5) yea their acurrate enough for someone to find a location, it tells the truth about the altitute . I think they should add replace the legend and put a legend with diffrent shaded colours so how the elevation in the whole map.